. Smithsonian miscellaneous collections. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 82. NUMBER 10 MORPHOLOGY OF THE BARK-BEETLES OF THEGENUS GNATHOTRICHUS EICHH. BYKARL E. SCHEDL. (Publication 3068) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JANUARY 24, 1931 Z^6 Both (^afftmorc (preee BALTIMORE, MD., U. S. A. MORPHOLOGY OF THE BARK-BEETLES OF THEGENUS GNATHOTRICHUS EICHH. By KARL E. SCHEDL CONTENTS PAGE I ntroduction 2 Abstracts of the literature up to date 3 A. The genus 3 B. Gtiathotrichus iiiatcriariiis Fitch 6 C. Gnathofrichxts rctitsus Lee 11 D. GnatJwtrichus sulcatus L
. Smithsonian miscellaneous collections. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 82. NUMBER 10 MORPHOLOGY OF THE BARK-BEETLES OF THEGENUS GNATHOTRICHUS EICHH. BYKARL E. SCHEDL. (Publication 3068) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION JANUARY 24, 1931 Z^6 Both (^afftmorc (preee BALTIMORE, MD., U. S. A. MORPHOLOGY OF THE BARK-BEETLES OF THEGENUS GNATHOTRICHUS EICHH. By KARL E. SCHEDL CONTENTS PAGE I ntroduction 2 Abstracts of the literature up to date 3 A. The genus 3 B. Gtiathotrichus iiiatcriariiis Fitch 6 C. Gnathofrichxts rctitsus Lee 11 D. GnatJwtrichus sulcatus Lee 13 Synonyma 14 Common names 15 The chitinous skeleton of the adult 15 General appearance, vestiture, color and size 15 The head 19 The appendages of the head 2i The antennae 22 The mouthparts 24 The thorax 30 The prothorax 31 The mesothorax 34 The metathorax 36 The abdomen 41 The spiracles 45 The legs 45 The wings 49 Mesathoracic wings or elytra 49 Metathoracic wings or hind wings 53 The male reproductive organs 57 The female reproductive organs 63 The alimentary canal 64 The larvae 65 The chitinous skeleton 70 The head 70 The appendages of the head 7i The antennae 7i The
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